Mendoza met Humphries in the ring on a later occasioin and he lost for a second time.句子中的第一处'a'是什么意思,不要行不行?第二处为什么是'a',而不是'the'?

原句是：Mendoza met Humphries in the ring on a later occasion.这里的in the ring是什么意思啊? 谢谢：） Mendoza met Humphries in the ring on a later occasioin and he lost for a second time.句子中的第一处'a'是什么意思,不要行不行?第二处为什么是'a',而不是'the'? Mendoza met Humphries in the ring on a later occassion and he lost for a second time.其中 in the ring 在此做什么翻译讲?如果是“随后”的意思为什么用这个词? MET是什么意思? met是什么意思 met a Miss Mendoza for New York tomorrow.A will leave B is going to C is leaving Mrs mendoza teaches ____music后面用什么形式的他们A they B them C their D theirs He met her and She met him meet的过去式met Met you by surprise met的动词原型 THE MET STORE怎么样 met什么意思 Met的意思 have you met him? met什么意思 请问英语MET是什么意思?